COM lister

import threading
import time
from tkinter import *
from tkinter import ttk
from serial.tools import list_ports


class App(ttk.Frame):
    def __init__(self, root, stringVar):
        """ Initialize the Frame"""
        ttk.Frame.__init__(self, root)
        self.root = root
        self.stringvar = stringVar
        threading.Thread.__init__(self)
        self.grid()
        self.label = ttk.Label(mainframe, textvariable=coms).grid(column=0, row=0, sticky=(W, E))
        self.run()

    def run(self):
        loop_active = True
        while loop_active:
            self.updatePorts()
            self.root.update()
            time.sleep(0.1)

    def updatePorts(self):
        self.list = list_ports.comports()
        self.portList = ""
        for port in self.list:
            self.portList += "{}\t{}\n".format(port.device, port.description)
        self.stringvar.set(self.portList)


root = Tk()
root.title("COM")
coms = StringVar()
mainframe = ttk.Frame(root, padding="3 3 12 12")
mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
root.columnconfigure(0, weight=1)
root.rowconfigure(0, weight=1)
app = App(root, coms)
root.mainloop()